content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  /*
   * Protocol Buffers - Google's data interchange format
   * Copyright 2014 Google Inc.  All rights reserved.
   * https://developers.google.com/protocol-buffers/
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package com.google.protobuf.jruby;
  
  import com.google.protobuf.DescriptorProtos;
  import com.google.protobuf.Descriptors;
  import org.jruby.*;
  import org.jruby.anno.JRubyClass;
  import org.jruby.anno.JRubyMethod;
  import org.jruby.runtime.Block;
  import org.jruby.runtime.ObjectAllocator;
  import org.jruby.runtime.ThreadContext;
  import org.jruby.runtime.builtin.IRubyObject;
  
  import java.util.HashMap;
  import java.util.Map;
  
  
  @JRubyClass(name = "Descriptor", include = "Enumerable")
  public class RubyDescriptor extends RubyObject {
      public static void createRubyDescriptor(Ruby runtime) {
          RubyModule protobuf = runtime.getClassFromPath("Google::Protobuf");
          RubyClass cDescriptor = protobuf.defineClassUnder("Descriptor", runtime.getObject(), new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyDescriptor(runtime, klazz);
              }
          });
          cDescriptor.includeModule(runtime.getEnumerable());
          cDescriptor.defineAnnotatedMethods(RubyDescriptor.class);
      }
  
      public RubyDescriptor(Ruby runtime, RubyClass klazz) {
          super(runtime, klazz);
      }
  
      /*
       * call-seq:
       *     Descriptor.new => descriptor
       *
       * Creates a new, empty, message type descriptor. At a minimum, its name must be
       * set before it is added to a pool. It cannot be used to create messages until
       * it is added to a pool, after which it becomes immutable (as part of a
       * finalization process).
       */
      @JRubyMethod
      public IRubyObject initialize(ThreadContext context) {
          this.builder = DescriptorProtos.DescriptorProto.newBuilder();
          this.fieldDefMap = new HashMap<String, RubyFieldDescriptor>();
          this.oneofDefs = new HashMap<IRubyObject, RubyOneofDescriptor>();
          return this;
      }
  
      /*
       * call-seq:
       *     Descriptor.name => name
       *
       * Returns the name of this message type as a fully-qualfied string (e.g.,
       * My.Package.MessageType).
       */
      @JRubyMethod(name = "name")
      public IRubyObject getName(ThreadContext context) {
          return this.name;
      }
  
      /*
       * call-seq:
       *    Descriptor.name = name
       *
       * Assigns a name to this message type. The descriptor must not have been added
       * to a pool yet.
       */
      @JRubyMethod(name = "name=")
      public IRubyObject setName(ThreadContext context, IRubyObject name) {
          this.name = name;
          this.builder.setName(Utils.escapeIdentifier(this.name.asJavaString()));
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.add_field(field) => nil
       *
       * Adds the given FieldDescriptor to this message type. The descriptor must not
       * have been added to a pool yet. Raises an exception if a field with the same
       * name or number already exists. Sub-type references (e.g. for fields of type
       * message) are not resolved at this point.
       */
      @JRubyMethod(name = "add_field")
      public IRubyObject addField(ThreadContext context, IRubyObject obj) {
          RubyFieldDescriptor fieldDef = (RubyFieldDescriptor) obj;
          this.fieldDefMap.put(fieldDef.getName(context).asJavaString(), fieldDef);
          this.builder.addField(fieldDef.build());
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.lookup(name) => FieldDescriptor
       *
       * Returns the field descriptor for the field with the given name, if present,
       * or nil if none.
       */
      @JRubyMethod
      public IRubyObject lookup(ThreadContext context, IRubyObject fieldName) {
          return this.fieldDefMap.get(fieldName.asJavaString());
      }
  
      /*
       * call-seq:
       *     Descriptor.msgclass => message_klass
       *
       * Returns the Ruby class created for this message type. Valid only once the
       * message type has been added to a pool.
       */
      @JRubyMethod
      public IRubyObject msgclass(ThreadContext context) {
          if (this.klazz == null) {
              this.klazz = buildClassFromDescriptor(context);
          }
          return this.klazz;
      }
  
      /*
       * call-seq:
       *     Descriptor.each(&block)
       *
       * Iterates over fields in this message type, yielding to the block on each one.
       */
      @JRubyMethod
      public IRubyObject each(ThreadContext context, Block block) {
          for (Map.Entry<String, RubyFieldDescriptor> entry : fieldDefMap.entrySet()) {
              block.yield(context, entry.getValue());
          }
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.add_oneof(oneof) => nil
       *
       * Adds the given OneofDescriptor to this message type. This descriptor must not
       * have been added to a pool yet. Raises an exception if a oneof with the same
       * name already exists, or if any of the oneof's fields' names or numbers
       * conflict with an existing field in this message type. All fields in the oneof
       * are added to the message descriptor. Sub-type references (e.g. for fields of
       * type message) are not resolved at this point.
       */
      @JRubyMethod(name = "add_oneof")
      public IRubyObject addOneof(ThreadContext context, IRubyObject obj) {
          RubyOneofDescriptor def = (RubyOneofDescriptor) obj;
          builder.addOneofDecl(def.build(builder.getOneofDeclCount()));
          for (RubyFieldDescriptor fieldDescriptor : def.getFields()) {
              addField(context, fieldDescriptor);
          }
          oneofDefs.put(def.getName(context), def);
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.each_oneof(&block) => nil
       *
       * Invokes the given block for each oneof in this message type, passing the
       * corresponding OneofDescriptor.
       */
      @JRubyMethod(name = "each_oneof")
      public IRubyObject eachOneof(ThreadContext context, Block block) {
          for (RubyOneofDescriptor oneofDescriptor : oneofDefs.values()) {
              block.yieldSpecific(context, oneofDescriptor);
          }
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.lookup_oneof(name) => OneofDescriptor
       *
       * Returns the oneof descriptor for the oneof with the given name, if present,
       * or nil if none.
       */
      @JRubyMethod(name = "lookup_oneof")
      public IRubyObject lookupOneof(ThreadContext context, IRubyObject name) {
          if (name instanceof RubySymbol) {
              name = ((RubySymbol) name).id2name();
          }
          return oneofDefs.containsKey(name) ? oneofDefs.get(name) : context.runtime.getNil();
      }
  
      public void setDescriptor(Descriptors.Descriptor descriptor) {
          this.descriptor = descriptor;
      }
  
      public Descriptors.Descriptor getDescriptor() {
          return this.descriptor;
      }
  
      public DescriptorProtos.DescriptorProto.Builder getBuilder() {
          return builder;
      }
  
      public void setMapEntry(boolean isMapEntry) {
          this.builder.setOptions(DescriptorProtos.MessageOptions.newBuilder().setMapEntry(isMapEntry));
      }
  
      private RubyModule buildClassFromDescriptor(ThreadContext context) {
          Ruby runtime = context.runtime;
  
          ObjectAllocator allocator = new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyMessage(runtime, klazz, descriptor);
              }
          };
  
          // rb_define_class_id
          RubyClass klass = RubyClass.newClass(runtime, runtime.getObject());
          klass.setAllocator(allocator);
          klass.makeMetaClass(runtime.getObject().getMetaClass());
          klass.inherit(runtime.getObject());
          RubyModule messageExts = runtime.getClassFromPath("Google::Protobuf::MessageExts");
          klass.include(new IRubyObject[] {messageExts});
          klass.instance_variable_set(runtime.newString(Utils.DESCRIPTOR_INSTANCE_VAR), this);
          klass.defineAnnotatedMethods(RubyMessage.class);
          return klass;
      }
  
      protected RubyFieldDescriptor lookup(String fieldName) {
          return fieldDefMap.get(Utils.unescapeIdentifier(fieldName));
      }
  
      private IRubyObject name;
      private RubyModule klazz;
  
      private DescriptorProtos.DescriptorProto.Builder builder;
      private Descriptors.Descriptor descriptor;
      private Map<String, RubyFieldDescriptor> fieldDefMap;
      private Map<IRubyObject, RubyOneofDescriptor> oneofDefs;
  }
  